EUP8010X
Charge Status Outputs
Charge Taper Detection, Termination and Recharge
The open-drain STAT1 and STAT2 outputs indicate
various charger operations as shown in the following
table. These status pins can be used to drive LEDs or
communicate to the host processor. Note that OFF
indicates the open-drain transistor is turned off.
The EUP8010X monitors the charging current during the
voltage regulation phase. Once the taper threshold,
I(TAPER),is detected the EUP8010X initiates the taper timer,
t(TAPER). Charge is terminated after the timer expires. The
resistor connected between the ISET and VSS, RSET
determines the taper detection level. The V(TAPER) and
(SET) parameters are specified in the specifications table.
,
Table 1. Status Pins Summary
K
CHARGE STATE
Precharge in progress
Fast charge in progress
Charge done
Charge suspend (temperature)
Timer fault
STAT1 STAT2
V
× K
(SET)
(TAPER)
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
ON
I
=
------------------ (3)
(TAPER)
R
SET
OFF
OFF
OFF
The EUP8010X resets the taper timer in the event that
the charge current returns above the taper threshold,
Sleep mode
I(TAPER)
.
OFF means the open-drain output transistor on the
STAT1 and STAT2 pins is in an off state.
In addition to the taper current detection, the EUP8010X
terminates charge in the event that the charge current falls
below the I(TERM) threshold. This feature allows for quick
recognition of a battery removal condition or insertion of
a fully charged battery. Note that charge timer and taper
timer are bypassed for this feature. The resistor
connected between the ISET and VSS, RSET, determines
the taper detection level. The V(TERM) and K(SET)
parameters are specified in the specifications table.
PG Output
The open-drain PG (Power Good) indicates when the
AC adapter is present. The output turns ON when a valid
voltage is detected. This output is turned off in the sleep
mode. The PG pin can be used to drive an LED or
communicate to the host processor.
V
× K
(SET)
(TERM)
I
=
-------------------- (4)
(TERM)
R
SET
CE Input (Charge Enable)
The CE digital input is used to disable or enable the
charge process. A low-level signal on this pin enables the
charge and a high-level signal disables the charge and
places the device in a low-power mode. A high-to-low
transition on this pin also resets all timers and timer fault
conditions.
After charge termination, the EUP8010X re-starts the
charge once the voltage on the OUT pin falls below the
V(RCH) threshold. This feature keeps the battery at full
capacity at all times.
Sleep Mode
TTE Input (Timer and Termination Enable)
The EUP8010X enters the low-power sleep mode if
AC-adapter is removed from the circuit. This feature
prevents draining the battery during the absence of input
supply.
TTE
The
digital input is used to disable or enable the
fast-charge timer and charge taper detection. A low-level
signal on this pin enables the fast-charge timer and taper
timer and a high-level signal disables this feature.
Thermal shutdown and Protection
The EUP8010X monitors the junction temperature, TJ, of
the die and suspends charging if TJ exceeds T(SHTDWN)
.
Charging resumes when TJ falls below T(SHTDWN) by
approximately 30 ℃.
DS8010X Ver 1.2 June 2007
10
EUTECH [ EUTECH MICROELECTRONICS INC ]
